diff --git a/src/data/balance/pokemon-evolutions.ts b/src/data/balance/pokemon-evolutions.ts
index bf34b5122dc..4866ab9b83d 100644
--- a/src/data/balance/pokemon-evolutions.ts
+++ b/src/data/balance/pokemon-evolutions.ts
@@ -9,10 +9,10 @@ import { Nature } from "#enums/nature";
 import { Biome } from "#enums/biome";
 import { Moves } from "#enums/moves";
 import { Species } from "#enums/species";
-import { TimeOfDay } from "#enums/time-of-day";
-import { DamageMoneyRewardModifier, ExtraModifierModifier, MoneyMultiplierModifier, TempExtraModifierModifier } from "#app/modifier/modifier";
 import { SpeciesFormKey } from "#enums/species-form-key";
-
+import { TimeOfDay } from "#enums/time-of-day";
+import { DamageMoneyRewardModifier, ExtraModifierModifier, MoneyMultiplierModifier, SpeciesStatBoosterModifier, TempExtraModifierModifier } from "#app/modifier/modifier";
+import type { SpeciesStatBoosterModifierType } from "#app/modifier/modifier-type";
 
 export enum SpeciesWildEvolutionDelay {
   NONE,
@@ -1572,8 +1572,8 @@ export const pokemonEvolutions: PokemonEvolutions = {
     new SpeciesEvolution(Species.DUSKNOIR, 1, EvolutionItem.REAPER_CLOTH, null, SpeciesWildEvolutionDelay.VERY_LONG)
   ],
   [Species.CLAMPERL]: [
-    new SpeciesEvolution(Species.HUNTAIL, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => p.gender === Gender.MALE, p => p.gender = Gender.MALE /* Deep Sea Tooth */), SpeciesWildEvolutionDelay.VERY_LONG),
-    new SpeciesEvolution(Species.GOREBYSS, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => p.gender === Gender.FEMALE, p => p.gender = Gender.FEMALE /* Deep Sea Scale */), SpeciesWildEvolutionDelay.VERY_LONG)
+    new SpeciesEvolution(Species.HUNTAIL, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => !!globalScene.findModifier(m => m instanceof SpeciesStatBoosterModifier && (m.type as SpeciesStatBoosterModifierType).key === "DEEP_SEA_TOOTH")), SpeciesWildEvolutionDelay.VERY_LONG),
+    new SpeciesEvolution(Species.GOREBYSS, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => !!globalScene.findModifier(m => m instanceof SpeciesStatBoosterModifier && (m.type as SpeciesStatBoosterModifierType).key === "DEEP_SEA_SCALE")), SpeciesWildEvolutionDelay.VERY_LONG)
   ],
   [Species.BOLDORE]: [
     new SpeciesEvolution(Species.GIGALITH, 1, EvolutionItem.LINKING_CORD, null, SpeciesWildEvolutionDelay.VERY_LONG)
diff --git a/src/modifier/modifier-type.ts b/src/modifier/modifier-type.ts
index 9c844596abc..19670e76f3f 100644
--- a/src/modifier/modifier-type.ts
+++ b/src/modifier/modifier-type.ts
@@ -584,7 +584,7 @@ export type SpeciesStatBoosterItem = keyof typeof SpeciesStatBoosterModifierType
  * @implements GeneratedPersistentModifierType
  */
 export class SpeciesStatBoosterModifierType extends PokemonHeldItemModifierType implements GeneratedPersistentModifierType {
-  private key: SpeciesStatBoosterItem;
+  public key: SpeciesStatBoosterItem;
 
   constructor(key: SpeciesStatBoosterItem) {
     const item = SpeciesStatBoosterModifierTypeGenerator.items[key];
@@ -1023,13 +1023,15 @@ class TempStatStageBoosterModifierTypeGenerator extends ModifierTypeGenerator {
 class SpeciesStatBoosterModifierTypeGenerator extends ModifierTypeGenerator {
   /** Object comprised of the currently available species-based stat boosting held items */
   public static readonly items = {
-    LIGHT_BALL: { stats: [ Stat.ATK, Stat.SPATK ], multiplier: 2, species: [ Species.PIKACHU ]},
-    THICK_CLUB: { stats: [ Stat.ATK ], multiplier: 2, species: [ Species.CUBONE, Species.MAROWAK, Species.ALOLA_MAROWAK ]},
-    METAL_POWDER: { stats: [ Stat.DEF ], multiplier: 2, species: [ Species.DITTO ]},
-    QUICK_POWDER: { stats: [ Stat.SPD ], multiplier: 2, species: [ Species.DITTO ]},
+    LIGHT_BALL: { stats: [ Stat.ATK, Stat.SPATK ], multiplier: 2, species: [ Species.PIKACHU ], rare: true },
+    THICK_CLUB: { stats: [ Stat.ATK ], multiplier: 2, species: [ Species.CUBONE, Species.MAROWAK, Species.ALOLA_MAROWAK ], rare: true },
+    METAL_POWDER: { stats: [ Stat.DEF ], multiplier: 2, species: [ Species.DITTO ], rare: true },
+    QUICK_POWDER: { stats: [ Stat.SPD ], multiplier: 2, species: [ Species.DITTO ], rare: true },
+    DEEP_SEA_SCALE: { stats: [ Stat.SPDEF ], multiplier: 2, species: [ Species.CLAMPERL ], rare: false },
+    DEEP_SEA_TOOTH: { stats: [ Stat.SPATK ], multiplier: 2, species: [ Species.CLAMPERL ], rare: false },
   };
 
-  constructor() {
+  constructor(rare: boolean) {
     super((party: Pokemon[], pregenArgs?: any[]) => {
       const items = SpeciesStatBoosterModifierTypeGenerator.items;
       if (pregenArgs && (pregenArgs.length === 1) && (pregenArgs[0] in items)) {
@@ -1056,6 +1058,9 @@ class SpeciesStatBoosterModifierTypeGenerator extends ModifierTypeGenerator {
 
           if (!hasItem) {
             if (checkedSpecies.includes(speciesId) || (!!fusionSpeciesId && checkedSpecies.includes(fusionSpeciesId))) {
+              if (values[i].rare === true) {
+                rare === true;
+              }
               // Add weight if party member has a matching species or, if applicable, a matching fusion species
               weights[i]++;
             } else if (checkedSpecies.includes(Species.PIKACHU) && hasFling) {
@@ -1339,7 +1344,7 @@ export type GeneratorModifierOverride = {
   count?: number;
 } & (
   | {
-      name: keyof Pick<typeof modifierTypes, "SPECIES_STAT_BOOSTER">;
+      name: keyof Pick<typeof modifierTypes, "SPECIES_STAT_BOOSTER" | "RARE_SPECIES_STAT_BOOSTER">;
       type?: SpeciesStatBoosterItem;
     }
   | {
@@ -1367,7 +1372,7 @@ export type GeneratorModifierOverride = {
       type?: EvolutionItem;
     }
   | {
-      name: keyof Pick<typeof modifierTypes, "FORM_CHANGE_ITEM">;
+      name: keyof Pick<typeof modifierTypes, "FORM_CHANGE_ITEM" | "RARE_FORM_CHANGE_ITEM">;
       type?: FormChangeItem;
     }
   | {
@@ -1438,7 +1443,8 @@ export const modifierTypes = {
   SUPER_LURE: () => new DoubleBattleChanceBoosterModifierType("modifierType:ModifierType.SUPER_LURE", "super_lure", 15),
   MAX_LURE: () => new DoubleBattleChanceBoosterModifierType("modifierType:ModifierType.MAX_LURE", "max_lure", 30),
 
-  SPECIES_STAT_BOOSTER: () => new SpeciesStatBoosterModifierTypeGenerator(),
+  SPECIES_STAT_BOOSTER: () => new SpeciesStatBoosterModifierTypeGenerator(false),
+  RARE_SPECIES_STAT_BOOSTER: () => new SpeciesStatBoosterModifierTypeGenerator(true),
 
   TEMP_STAT_STAGE_BOOSTER: () => new TempStatStageBoosterModifierTypeGenerator(),
 
@@ -1705,6 +1711,7 @@ const modifierPool: ModifierPool = {
     new WeightedModifierType(modifierTypes.DIRE_HIT, 4),
     new WeightedModifierType(modifierTypes.SUPER_LURE, lureWeightFunc(15, 4)),
     new WeightedModifierType(modifierTypes.NUGGET, skipInLastClassicWaveOrDefault(5)),
+    new WeightedModifierType(modifierTypes.SPECIES_STAT_BOOSTER, 4),
     new WeightedModifierType(modifierTypes.EVOLUTION_ITEM, () => {
       return Math.min(Math.ceil(globalScene.currentBattle.waveIndex / 15), 8);
     }, 8),
@@ -1748,7 +1755,7 @@ const modifierPool: ModifierPool = {
       }
       return 0;
     }),
-    new WeightedModifierType(modifierTypes.SPECIES_STAT_BOOSTER, 12),
+    new WeightedModifierType(modifierTypes.RARE_SPECIES_STAT_BOOSTER, 12),
     new WeightedModifierType(modifierTypes.LEEK, (party: Pokemon[]) => {
       const checkedSpecies = [ Species.FARFETCHD, Species.GALAR_FARFETCHD, Species.SIRFETCHD ];
       // If a party member doesn't already have a Leek and is one of the relevant species, Leek can appear
diff --git a/src/test/items/light_ball.test.ts b/src/test/items/light_ball.test.ts
index 987a5ab8b0c..0bba57f9f71 100644
--- a/src/test/items/light_ball.test.ts
+++ b/src/test/items/light_ball.test.ts
@@ -29,7 +29,7 @@ describe("Items - Light Ball", () => {
   });
 
   it("LIGHT_BALL activates in battle correctly", async() => {
-    game.override.startingHeldItems([{ name: "SPECIES_STAT_BOOSTER", type: "LIGHT_BALL" }]);
+    game.override.startingHeldItems([{ name: "RARE_SPECIES_STAT_BOOSTER", type: "LIGHT_BALL" }]);
     const consoleSpy = vi.spyOn(console, "log");
     await game.startBattle([
       Species.PIKACHU
@@ -83,7 +83,7 @@ describe("Items - Light Ball", () => {
     expect(spAtkValue.value / spAtkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPATK, spAtkValue);
 
@@ -122,7 +122,7 @@ describe("Items - Light Ball", () => {
     expect(spAtkValue.value / spAtkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPATK, spAtkValue);
 
@@ -161,7 +161,7 @@ describe("Items - Light Ball", () => {
     expect(spAtkValue.value / spAtkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPATK, spAtkValue);
 
@@ -189,7 +189,7 @@ describe("Items - Light Ball", () => {
     expect(spAtkValue.value / spAtkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "LIGHT_BALL" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPATK, spAtkValue);
 
diff --git a/src/test/items/metal_powder.test.ts b/src/test/items/metal_powder.test.ts
index 42ef9c1bb16..60b69b5c396 100644
--- a/src/test/items/metal_powder.test.ts
+++ b/src/test/items/metal_powder.test.ts
@@ -29,7 +29,7 @@ describe("Items - Metal Powder", () => {
   });
 
   it("METAL_POWDER activates in battle correctly", async() => {
-    game.override.startingHeldItems([{ name: "SPECIES_STAT_BOOSTER", type: "METAL_POWDER" }]);
+    game.override.startingHeldItems([{ name: "RARE_SPECIES_STAT_BOOSTER", type: "METAL_POWDER" }]);
     const consoleSpy = vi.spyOn(console, "log");
     await game.startBattle([
       Species.DITTO
@@ -79,7 +79,7 @@ describe("Items - Metal Powder", () => {
     expect(defValue.value / defStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.DEF, defValue);
 
     expect(defValue.value / defStat).toBe(2);
@@ -112,7 +112,7 @@ describe("Items - Metal Powder", () => {
     expect(defValue.value / defStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.DEF, defValue);
 
     expect(defValue.value / defStat).toBe(2);
@@ -145,7 +145,7 @@ describe("Items - Metal Powder", () => {
     expect(defValue.value / defStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.DEF, defValue);
 
     expect(defValue.value / defStat).toBe(2);
@@ -167,7 +167,7 @@ describe("Items - Metal Powder", () => {
     expect(defValue.value / defStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "METAL_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.DEF, defValue);
 
     expect(defValue.value / defStat).toBe(1);
diff --git a/src/test/items/quick_powder.test.ts b/src/test/items/quick_powder.test.ts
index d30111cbd6a..ce8073b7d76 100644
--- a/src/test/items/quick_powder.test.ts
+++ b/src/test/items/quick_powder.test.ts
@@ -29,7 +29,7 @@ describe("Items - Quick Powder", () => {
   });
 
   it("QUICK_POWDER activates in battle correctly", async() => {
-    game.override.startingHeldItems([{ name: "SPECIES_STAT_BOOSTER", type: "QUICK_POWDER" }]);
+    game.override.startingHeldItems([{ name: "RARE_SPECIES_STAT_BOOSTER", type: "QUICK_POWDER" }]);
     const consoleSpy = vi.spyOn(console, "log");
     await game.startBattle([
       Species.DITTO
@@ -79,7 +79,7 @@ describe("Items - Quick Powder", () => {
     expect(spdValue.value / spdStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPD, spdValue);
 
     expect(spdValue.value / spdStat).toBe(2);
@@ -112,7 +112,7 @@ describe("Items - Quick Powder", () => {
     expect(spdValue.value / spdStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPD, spdValue);
 
     expect(spdValue.value / spdStat).toBe(2);
@@ -145,7 +145,7 @@ describe("Items - Quick Powder", () => {
     expect(spdValue.value / spdStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPD, spdValue);
 
     expect(spdValue.value / spdStat).toBe(2);
@@ -167,7 +167,7 @@ describe("Items - Quick Powder", () => {
     expect(spdValue.value / spdStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "QUICK_POWDER" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.SPD, spdValue);
 
     expect(spdValue.value / spdStat).toBe(1);
diff --git a/src/test/items/thick_club.test.ts b/src/test/items/thick_club.test.ts
index 08b19250ea7..1e5d6d46c42 100644
--- a/src/test/items/thick_club.test.ts
+++ b/src/test/items/thick_club.test.ts
@@ -29,7 +29,7 @@ describe("Items - Thick Club", () => {
   });
 
   it("THICK_CLUB activates in battle correctly", async() => {
-    game.override.startingHeldItems([{ name: "SPECIES_STAT_BOOSTER", type: "THICK_CLUB" }]);
+    game.override.startingHeldItems([{ name: "RARE_SPECIES_STAT_BOOSTER", type: "THICK_CLUB" }]);
     const consoleSpy = vi.spyOn(console, "log");
     await game.startBattle([
       Species.CUBONE
@@ -79,7 +79,7 @@ describe("Items - Thick Club", () => {
     expect(atkValue.value / atkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
 
     expect(atkValue.value / atkStat).toBe(2);
@@ -101,7 +101,7 @@ describe("Items - Thick Club", () => {
     expect(atkValue.value / atkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
 
     expect(atkValue.value / atkStat).toBe(2);
@@ -123,7 +123,7 @@ describe("Items - Thick Club", () => {
     expect(atkValue.value / atkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
 
     expect(atkValue.value / atkStat).toBe(2);
@@ -160,7 +160,7 @@ describe("Items - Thick Club", () => {
     expect(atkValue.value / atkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
 
     expect(atkValue.value / atkStat).toBe(2);
@@ -197,7 +197,7 @@ describe("Items - Thick Club", () => {
     expect(atkValue.value / atkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
 
     expect(atkValue.value / atkStat).toBe(2);
@@ -219,7 +219,7 @@ describe("Items - Thick Club", () => {
     expect(atkValue.value / atkStat).toBe(1);
 
     // Giving Eviolite to party member and testing if it applies
-    game.scene.addModifier(modifierTypes.SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
+    game.scene.addModifier(modifierTypes.RARE_SPECIES_STAT_BOOSTER().generateType([], [ "THICK_CLUB" ])!.newModifier(partyMember), true);
     game.scene.applyModifiers(SpeciesStatBoosterModifier, true, partyMember, Stat.ATK, atkValue);
 
     expect(atkValue.value / atkStat).toBe(1);